Theorem. The diagonals of a rectangle bisect each other and have the same length.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter5: Similar Triangles
Section5.2: Similar Polygons
Problem 34E: In the drawing, ABDCEF. Suppose that transversals l and m are also parallel. D and C are the...
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Theorem. The diagonals of a rectangle bisect each other and have the same
length.
Proof. Let DABCD be a rectangle, i.e., a quadrilateral that has insert defin-
ing characteristic. Draw diagonals AC and BD.
insert figure that illustrates the setup
Explain why the diagonals bisect each other. (Do not work too hard.
Make use of a combination of theorems we have already proven.)
Next we will show the diagonals have the same length. Note that AC is
a side of triangle blah and BD is a side of triangle blah. Thus it suffices to
show triangles blah and blah are congruent because then their corresponding
sides will be congruent.
insert figure highlighting the two triangles of interest
Write an argument for why the triangles you identified in the previous
step are congruent.
insert a diagram that uses color or line style to mark the segments or angles
you are using to justify congruence of the triangles
Therefore the corresponding sides AC and BD are congruent.
Thus the diagonals of a rectangle bisect each other and have the same
length.
Transcribed Image Text:Theorem. The diagonals of a rectangle bisect each other and have the same length. Proof. Let DABCD be a rectangle, i.e., a quadrilateral that has insert defin- ing characteristic. Draw diagonals AC and BD. insert figure that illustrates the setup Explain why the diagonals bisect each other. (Do not work too hard. Make use of a combination of theorems we have already proven.) Next we will show the diagonals have the same length. Note that AC is a side of triangle blah and BD is a side of triangle blah. Thus it suffices to show triangles blah and blah are congruent because then their corresponding sides will be congruent. insert figure highlighting the two triangles of interest Write an argument for why the triangles you identified in the previous step are congruent. insert a diagram that uses color or line style to mark the segments or angles you are using to justify congruence of the triangles Therefore the corresponding sides AC and BD are congruent. Thus the diagonals of a rectangle bisect each other and have the same length.
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